I don't think I've found any new favorite games in the last two years. Galatea had a great ending, and Behind You was surprisingly fun, but they didn't make the all-time favorites list. Neither did Diggs Nightcrawler, despite being a charmingly unique experience. I haven't replayed any of the games in my list in far longer than two years, either.

It's just that playing games that I used to love so much to the point of putting them on this topic (Ratchet 3, Crash 3, Cave Story, MG Rising) and then finding them to be "so off-putting for whatever reason that I could barely bring myself to finish them" (or in the case of Rising, not finish it at all, yet) is really depressing.
And I played them for this exact reason, as I said some time ago regarding CB3 and CV on the "What are you playing" topic, to see if they were worthy of entering my top 10 (which I'm making just because everyone and their dog on the Internet is 100% sure of theirs). Even you will probably agree that 24 "favorite" games were too many, and that's excluding stuff I played these past two years.
Oh well.
After I'm done with Nier, I'll keep on playing more of them and delete them accordingly.

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I've had quite a bit of trouble choosing which one was on top of which, specifically between 3D World and Crash 2, Mana Khemia and Valkyrie Profile (which is Number 10, but I needed a spot for DIY, more on that later), and Nier and Undertale.
The first couple was the "worst", because nostalgia. Ultimately, though some of the former's flaws are pretty big (lack of consistency between the world map and its levels, mostly terrible bosses...), ultimately I had more fun.
As for the second couple, Valkyrie's dungeons and battles are insanely fun, the latter are also pretty button-mashy. It's also a pretty easy game, once you get the mechanics, the same mechanics it doesn't want to explain and you have to Google for. Finally, the true, and only decent, ending, which is the closest thing to a plot you get here, is twice as obscure as those. Mana Khemia does look terrible (terrible, the maps, at least, the battle sprites are amazing), and farming for materials kinda boring, but its battle system is pure gold (maybe even better than the Press Turn, maybe not), as is its lighthearted "slice of life" approach to the story.
Both Nier and Undertale have great story and music, and barely serviceable gameplay. But the latter at least tries to make everything-besides-dodging-attacks fun.

KHII really is my favorite game ever. FM+ makes it even better. Birth by Sleep may have a better battle system thanks to its Commands and Styles, but it doesn't have spectacular fights and bosses like this one does. Fusing stuff to get Abilities is also a pain in the butt. And you don't get to equip anything. So, yeah, I love KHII. If I could, I'd say 2.5HD, which includes both, but that's cheating.
Bloodborne is perfection. I legit can not find a single flaw in this game. Others may disagree, but I don't care. Too hard, so not everyone can enjoy this masterpiece? Not-state-of-the-art graphics? That's as far as I can go. KHII holds a (more) special place in my heart, though.
DariusBurst Chronicle Saviours is... C'mon, it's DariusBurst Chronicle Saviours.
Shin Megami Tensei IV is quite surprising, I know. I myself didn't know I would have enjoyed this much after I abandoned it for a year or more. The Press Turn System is great, as I said countless times, exploring Tokyo (and other stuff) was also great, and the music post-Mikado was the best soundtrack I've heard in a JRPG, no joke.

Why is WarioWare DIY not Number "whatever", you ask? Well, because it's not a game, and as such it can not be compared to the others, that's all. A great creation tool, but as a game, eh, the others were better, but never groundbreaking.
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I guess Dirt 3 is free right now on the Humble Bundle for the PC. Really enjoyed this one and it's one of the few games that I've ever gotten all the achievements in.

It wasn't the traditional rally racer that I wanted to see, but Codemasters definitely moved towards the right direction with it after a somewhat lackluster Dirt 2 (Which I still earned all the achievements on). And this is the complete edition, so it includes the Monte Carlo rally add-on that I thought was the best part of the game.

Even the gymkhana stuff ended up fun. I'm a racing fan and don't like to see perversion in the sport such as Japanese drift racing, but the challenge to sometimes do 25 different tasks just right, one after the other and with a very strict time limit to get a platinum medal, felt like stepping back 25 years with videogame difficulty.

Although anyone with bad memories of the tutorial in Driver will hate it since it's sort of like that but with timer where every 1/10th of a second matters, it was refreshing to see no room for error for a change. :)

I'm a bit impressed, and also confused, that you went to so much trouble to define your Top 10 Favorite Games list, AxelMill. There seems to have been some degree of agony and disappointment in the process. Personally, I'm just content to say, "Yeah, I liked that game," or "That game is REALLY good!", or "No, that game's terrible." In my childhood, I had a nasty inclination to try to rank everything, and eventually getting rid of that tendency alleviated my stress levels significantly.

I've always been excessively unsure of what games I considered "REALLY good", as you said, and doing this top 10 helped me a lot. I still would praise stuff I didn't play for a long time just for the sake of nostalgia if I didn't try to make this.
But look at this, there are, like, two "old" games out of 10.

There seems to have been some degree of agony and disappointment in the process.

A lot of disappointment, if you were following my Games [I'm] Playing Right Now posts, but not much agony.
At least I had something to do. Now I have 16 days of absolutely nothing.
I used to fight final bosses and write down the time they took me to beat them next to their name on a sheet of paper. Maybe I'll do this again. For the lulz.

In my childhood, I had a nasty inclination to try to rank everything, and eventually getting rid of that tendency alleviated my stress levels significantly.

I'm always stressed, so it's not like a little bit more will change anything.